This physiological study defines the relationship between critical power and fatigue threshold using electromyographic data during cycling.
CP yields lower workload than FT; leaves open which threshold better informs exercise prescription in cardiac patients.
The purpose of this study was to define the relation between ‘critical power’ (CP) and the onset of fatigue (fatigue threshold or FT) as estimated from electromyographic data taken from representative leg muscles during cycling. The rate of rise in integrated EMG (IEMG) activity as a function of time (IEMG slope) was calculated at each of three or four constant power output ergometer bouts for 11 subjects. The IEMG slopes so obtained were plotted against workload resulting in linear plots (0-88 <R2 <0.99( which were extrapolated to zero slope to give an intercept on the power axis which was interpreted as the fatigue threshold (FT). The mean workload at CP was 169-5 +12-8 W compared with 1905 ± 14-0 W at FT (p
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deVries et al. (1982) studied this question.
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